Wittig and horner-wittig coupling reactions of 2-substituted cyclic ethers and their application to spiroketal synthesis
作者:Steven V Ley、Barry Lygo、Helen M. Organ、Anne Wonnacott
DOI:10.1016/s0040-4020(01)91403-6
日期:1985.1
Wittig and Horner-Wittig coupling reactions of tetrahydropyran or tetrahydrofuran 2-triphenylphosphonium salts or 2-diphenylphosphine oxides with aldehydes and lactols affords good yields of the corresponding enol ethers. In selected examples these enol ether products may be further converted to spiroketals some of which are natural pheromones derived from Dacus oleae and Paravespula vulgaris.
Palladium mediated spiroketal synthesis: application to pheromone synthesis
作者:Jeremy C. Conway、Peter Quayle、Andrew C. Regan、Christopher J. Urch
DOI:10.1016/j.tet.2005.09.055
日期:2005.12
Stereospecific Stille coupling reactions of 2-metallo-dihydropyrans with Z-vinyl iodo alcohols and subsequent cyclisation provides rapid access to 1,7-dioxaspiro[5.5]undecane family of spiroketals.
Mercury(II)-mediated routes to some side-chain functionalised 1,7-dioxaspiro[5.5]undecanes. Applications of Luche-Barbier chemoselective addition to ketoaldehydes
作者:James J. De Voss、Joanne F. Jamie、Joanne T. Blanchfield、Mary T. Fletcher、Michael G. O'Shea、William Kitching
DOI:10.1016/s0040-4020(01)96110-1
日期:1991.3
propargyl bromide under Luche-Barbier conditions. Oxymercuration-cyclisation of the resulting hydroxyketones, followed by reductive or oxidative demercuration, provides functionalised spiroacetals, some of which are of insect origin.
Ketal-tethered ring-closing metathesis. An unconventional approach to constructing spiroketals and total synthesis of an insect pheromone
作者:Sunil K Ghosh、Richard P Hsung、Jiashi Wang
DOI:10.1016/j.tetlet.2004.05.017
日期:2004.7
An unconventional approach to constructing spiroketals via ring-closing metathesis of cyclic ketals is described here. This method possesses a good generality with no loss of stereochemical integrity at the spiro center under standard RCM conditions. This approach has been applied to the synthesis of an insect pheromone to demonstrate its synthetic potential. (C) 2004 Elsevier Ltd. All rights reserved.
Preparation and reactions of 2-benzenesulphonyltetrahydropyran